<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        input::placeholder {
            color: pink;
        }
    </style>
</head>

<body>
    <form action="">
        <input type="text" name="sear" autocomplete="off" autofocus required placeholder="100">
        <input type="file" name="" id="" multiple>
        <input type="submit" value="提交">
    </form>
</body>

</html>